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20NiCrMoS6-4

1.6571
alloy_steelcase_hardening
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Free-cutting variant of 20NiCrMo6-4 — S addition for improved machinability. NiCrMo case hardening steel with excellent core toughness and deep hardenability. Used for high-volume CNC production of automotive transmission gears, pinions, and shafts.

International equivalents

FlagStandardCountryGradeNumberMatch
🇪🇺ENEurope20NiCrMoS6-4 / 1.65711.6571100%

Sources: EN 10084

Chemical composition comparison (wt%)

Side-by-side: 20NiCrMoS6-4 (EN 10084) vs 20NiCrMoS6-4 / 1.6571 (EN) (EN 10084)

Element20NiCrMoS6-4 (EN 10084)20NiCrMoS6-4 / 1.6571 (EN)Overlap
C—0.17–0.23%—
Mn—0.6–0.9%—

Mechanical properties

Compatibility verdict

20NiCrMoS6-4 and 20NiCrMoS6-4 / 1.6571: 100% composition match

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